Tutorial: Implementing Radius in Wireless Router

Topology

Server
IP address : 192.168.0.2/24
AAA configuration :

• Client name : ap
• Client IP : 192.168.0.1
• Server type : Radius
• Secret key : cisco
• User name : admin
• Password : cisco

Linksys WRT300N
IP address : 192.168.0.1/24
Wireless Security : WPA2-Enterprise
Encryption : AES
Radius Server : 192.168.0.2
Key : cisco

Client
IP address : 192.168.0.100/24 (static or DHCP)
Wireless Security : WPA2-Enterprise
Encryption : AES
Username : admin
Password : cisco

To connect per user (client), you need to add more the username and password  fields in AAA Server so that every user will authenticate using their own account.